An iris recognition device for improving the iris image quality of a mobile terminal

Abstract

The invention provides an iris recognition device for improving the iris image quality of a mobile terminal, comprising an infrared light emitting unit, an image acquisition unit, a feedback module, a power supply module and an image processing unit, and the infrared light emitting unit includes a group Or multiple sets of infrared lamps and diverging lenses can emit infrared light with a first divergence angle, the first divergence angle is greater than the field of view angle of the image acquisition unit; the image acquisition unit is used to collect the iris image of the human eye, and can convert the light signal into The digital signal forms a digital image, and at the same time provides a synchronous control signal to the infrared light emitting unit to control the work of the infrared light emitting unit; the image processing unit is used to process the captured iris image of the human eye, and send corresponding control to other modules according to the processing result signal; the feedback module is used to provide feedback signals for human-computer interaction; the power supply module provides power for the infrared light emitting unit; the distance between the infrared light emitting unit and the image acquisition unit is at least 5mm.

Description

technical field [0001] The invention relates to an iris recognition device and a control method thereof, in particular to an iris recognition device for a mobile terminal and a mobile terminal including the iris recognition device. Background technique [0002] The personal information security and network interaction information security issues of mobile devices (such as mobile phones, tablet computers, laptops, etc.) are becoming more and more prominent. In order to ensure information security, many manufacturers have integrated various identification devices on mobile devices. For example, mobile devices have successfully integrated face recognition or fingerprint recognition devices for identification. [0003] The iris is an integral part of the eye, the ring of tissue between the pupil and the sclera, and the pattern of the iris varies from eye to eye and stays the same throughout life. Therefore, compared with face recognition and fingerprint recognition technologie...

AI Technical Summary

Problems solved by technology

[0004] However, the current front-end image acquisition unit configured on mobile terminals is mainly used for Selfie functions, and only supports visible light imaging, and infrared light is removed by filters; and iris recognition requires near-infrared imaging, and infrared light must be able to reach image sensor chip

Therefore, the existing front-end image acquisition unit of the mobile terminal cannot directly support iris recognition, and it is necessary to add an infrared light emitting unit light, such as a high-brightness infrared LED light, and modify the existing front-end image acquisition unit module to support iris recognition

[0005] After adding the infrared light emitting unit lamp, if the user wears glasses and uses the iris recognition function, from the captured image, the illuminating light will form a light spot on the glasses lens. When the light spot happens to be in the iris area, it will block the iris itself. texture, which affects the quality of the iris image

Due to the limited battery capacity of mobile phones, the infrared light emitting unit lamps generally installed on mobile phones use low-power LEDs. When shooting the iris of a user wearing glasses, due to the scattering, reflection and absorption of infrared light by the glasses lens, It will reduce the infrared light energy reaching the sensor chip, reduce the signal-to-noise ratio, and cause the iris texture to be unclear, thus affecting the quality of the iris image

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